Unexpected compound reformation in the dense selenium-hydrogen system

• Published in: Communications materials Vol. 6; no. 1; pp. 193 - 7
• Main Authors: Hu, Huixin, Kuzovnikov, Mikhail A., Shuttleworth, Hannah A., Marqueño, Tomas, Yan, Jinwei, Osmond, Israel, Gorelli, Federico A., Gregoryanz, Eugene, Dalladay-Simpson, Philip, Ackland, Graeme J., Peña-Alvarez, Miriam, Howie, Ross T.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01.12.2025; Nature Publishing Group; Nature Portfolio
• Subjects: 639/301/119/1002; 639/638/440/94; 639/766/119/2795; Chemistry and Materials Science; Decomposition; Density functional theory; Diamond anvil cells; High pressure; High temperature; Hydrides; Hydrogen; Interstices; Lasers; Materials Science; Molecular chains; Phase transitions; Room temperature; Selenium; Spectrum analysis; Superconductivity

The H 2 Se molecule and the van der Waals compound (H 2 Se) 2 H 2 are both unstable upon room temperature compression, dissociating into their constituent elements above 22 GPa. Through a series of high pressure-high temperature diamond anvil cell experiments, we report the unexpected formation of a...